JP7580013B1 - Elevator fixed rod gripping device and main rope replacement method - Google Patents

Abstract

A fixed rod gripping device (90) for gripping the fixed rod (10) between the support nut (15) and the coil spring (13) during removal or installation of the fixed rod (10) from the rod support (40). The fixed rod holding device (90) comprises a holding portion (94) including a first block (91) and a second block (92) connected by a connecting member (93) so as to be capable of opening and closing in the horizontal direction, and when the holding portion (94) is in a closed state, a through hole (95) through which the fixed rod (10) can pass is provided at the joint surface of the first block (91) and the second block (92), and a locking portion (96) is formed in the through hole (95) which engages with a male threaded portion (16) provided on the outer periphery of the fixed rod (10) and prevents axial movement of the fixed rod (10), and a closing portion (97) which closes the first block (91) and the second block (92) is provided on the side opposite the connecting member (93) side of the holding portion (94).

Description

The present invention relates to an elevator fixed rod holding device and a main rope replacement method.

In the process of replacing the main rope of a 2:1 roping elevator, workers must remove the existing main rope end and fix the new main rope end to the floor of the machine room or the beam above the hoistway where the rope end is fixed (see Patent Document 1). The main rope end is connected to a fixed rod having a male thread, and the fixed rod is supported by a so-called rod support, such as the floor of the machine room or the beam above the hoistway, by screwing a support nut onto the male thread via a coil spring. When attaching or detaching the main rope end, workers must tighten or loosen the support nut while holding the fixed rod with their hands to prevent the fixed rod from falling.

JP 2008-037624 A

Elevator main ropes are generally installed in multiple pieces and weigh more than 1 kg per meter, so the existence of a process in rope replacement work that relies on manual labor by workers, as described above, reduces work efficiency.

The fixed rod holding device of the present invention is provided in an elevator in which a fixed rod connected to the end of the elevator main rope is supported by a support nut via a coil spring on a rod support provided in a hoistway, and when the fixed rod is removed or attached to the rod support, it holds the fixed rod between the support nut and the coil spring, and includes a holding section including a first block and a second block connected by a connecting member so that they can be opened and closed horizontally, and when the holding section is in a closed state, a through hole through which the fixed rod can pass is provided on the joint surface of the first block and the second block, and a locking section is formed in the through hole which engages with a male threaded section provided on the outer periphery of the fixed rod to prevent axial movement of the fixed rod, and a closing section which closes the first block and the second block is provided on the side opposite the connecting member side of the holding section.

The main rope replacement method according to the present invention is a method for replacing the main rope of an elevator using the fixed rod gripping device according to the present invention, and includes the steps of: lifting up the existing fixed rod to separate the coil spring and the support nut and attaching the fixed rod gripping device between the coil spring and the support nut in order to remove the existing fixed rod connected to the end of the existing main rope from the rod support; removing the support nut from the male thread of the existing fixed rod and connecting one end of the rod guide rope to the upper end of the existing fixed rod via a wire for the rod guide rope; removing the fixed rod gripping device from the existing fixed rod; and pulling out the existing fixed rod from the rod support while paying out the rod guide rope, and then removing the existing main rope from the rod support. a step of connecting one end of the rod guide rope to the upper end of the newly installed fixed rod via a wire for the rod guide rope, and then pulling the rod guide rope up to the upper side of the rod support and attaching a fixed rod holding device to the newly installed fixed rod via a coil spring in order to attach the newly installed fixed rod connected to the end of the newly installed main rope to the rod support; a step of removing the rod guide rope and the wire for the rod guide rope from the upper end of the newly installed fixed rod and attaching a support nut to the male threaded portion of the newly installed fixed rod; a step of removing the fixed rod holding device from the newly installed fixed rod, supporting the newly installed fixed rod on the rod support via the coil spring, and attaching the newly installed main rope to the rod support.

According to the present invention, by holding the fixed rod with the gripping device, the worker can use both hands to perform tasks such as tightening and loosening the support nut, making it easy to attach and remove the fixed rod to the rod support. In addition, according to the main rope replacement method of the present invention, the process that relies on the worker's manual labor can be shortened, making it possible to replace the main rope more efficiently than before.

FIG. 1 is a diagram showing a schematic configuration for explaining the mechanism of a 2:1 rope elevator. An enlarged view of the rope stopper. FIG. 13 is an enlarged view of the rope stopper showing a worker holding the fixed rod. 1 is a perspective view of a fixed rod gripping device according to an embodiment, as viewed from a closing portion side. FIG. 1 is a perspective view of a fixed rod holding device according to an embodiment, as viewed from a connecting portion side. 1 is a diagram showing a fixed rod holding device according to an embodiment as viewed from above. 1 is an overall perspective view showing an open state of a fixed rod gripping device according to an embodiment; 1 is an enlarged view of a rope stopper illustrating a state in which a fixed rod gripping device according to an embodiment is used. FIG. 1 is an enlarged view of a rope stopper illustrating a state in which a fixed rod gripping device according to an embodiment is used. FIG. 1 is an enlarged view of a rope stopper illustrating a state in which a fixed rod gripping device according to an embodiment is used. FIG. FIG. 1 is a flow diagram showing a method for replacing the main rope of a 2:1 roping elevator. FIG. 1 is a diagram showing a schematic configuration for explaining a method for replacing a main rope of a 2:1 roping elevator. 1 is a diagram showing a schematic configuration for explaining removal of an existing fixed rod in a method for replacing a main rope using a fixed rod holding device which is an example of an embodiment. FIG. 1 is a diagram showing a schematic configuration for explaining removal of an existing fixed rod in a method for replacing a main rope using a fixed rod holding device which is an example of an embodiment. FIG. 1 is a diagram showing a schematic configuration for explaining a mid-way state of a main rope replacement method using a fixed rod gripping device, which is an example of an embodiment. FIG. 1 is a diagram showing a schematic configuration for explaining the installation of a new fixed rod in a method for replacing a main rope using a fixed rod holding device which is an example of an embodiment. FIG. 1 is a diagram showing a schematic configuration for explaining the installation of a newly installed fixed rod and the completed state of the work in a method for replacing a main rope using a fixed rod holding device, which is an example of an embodiment. FIG.

Below, an embodiment of the present invention will be described in detail with reference to the attached drawings. Note that the embodiment described below is merely an example, and the present invention is not limited to the following embodiment. Figure 1 is a diagram showing a schematic configuration for explaining the mechanism of a 2:1 rope elevator. Figure 2 is an enlarged view of a rope stopper.

As shown in Figure 1, the 2:1 roping elevator allows passengers (not shown) to travel to each floor between the top floor landing 22 and the bottom floor landing 23 by having a car 2 and a counterweight 3 connected to a main rope 7 rise and fall in a bucket-like manner in a hoistway 1. The main rope 7 is wound around a car pulley 21 provided on the top of the car 2, a counterweight pulley 31 provided on the top of the counterweight 3 linked to the car 2, and a sheave 51 and a deflector pulley 6 of a hoisting machine 5 installed in a machine room 4 above the hoistway 1.

Fixed rods 10 are connected to both ends of the main rope 7 via rope sockets 8, and the fixed rods 10 pass through openings 41 provided in the rod supports 40 and are supported by the rod supports 40 via rope stopper 9 mechanisms. The rod supports 40 are provided in the hoistway 1, and in elevators in which a machine room 4 is provided above the hoistway 1, they are the floor of the machine room 4. In elevators that do not have a machine room 4, a beam provided above the hoistway 1 corresponds to the rod support 40.

As shown in Figure 2, the rope stopper 9 is a mechanism in which a fixed rod 10 connected to the end of a main rope 7 via a rope socket 8 passes through an opening 41 provided in the rod support 40 and is supported by a support nut 15 on the upper side of the rod support 40 via a coil spring 13, etc., which will be described later.

The rope socket 8 is a generally cylindrical jig with openings at the top and bottom, and a pin hole 17, which is a through hole for inserting the rod pin 11 described later, is provided horizontally near the upper opening. The rope socket 8 may narrow toward the lower main rope 7 side opening. The main rope 7 is inserted from the main rope 7 side opening, folded back inside the rope socket 8, and fixed to the rope socket 8 by a well-known terminal processing method. The fixed rod 10 inserted into the upper opening is connected to the main rope 7 end via the rope socket 8 by being engaged with the rod pin 11 that passes through a split pin hole (not shown) provided at the lower end of the fixed rod 10 and the pin hole 17 of the rope socket 8.

The fixed rod 10 is a rod-shaped member, and has a male threaded portion 16 at the upper end, which is the other end side of the end fixed to the rope socket 8 by the rod pin 11. The fixed rod 10 connected to the end of the main rope 7 passes through an opening 41 in the rod support 40, and protrudes above the rod support 40 via the rod support side spring receiving member 12, the coil spring 13, and the support nut side spring receiving member 14. The fixed rod 10 is supported by the rod support 40 by attaching a support nut 15 to the male threaded portion 16. For example, a double nut that combines a type 3 nut and a type 1 nut is used as the support nut 15.

The coil spring 13 has the function of elastically supporting the fixed rod 10 relative to the rod support 40. Specifically, by loosening or tightening the support nut 15 attached to the male threaded portion 16 of the fixed rod 10, the coil spring 13 elastically deforms, making it possible to adjust the tension of the main rope 7. The inner diameter of the coil spring 13 is set to a dimension that allows the fixed rod 10 to be inserted therethrough, and further allows the rod guide rope wire 77 and rod guide rope 78, which will be described later in FIG. 3, to be inserted therethrough.

Next, the procedure for attaching and detaching the conventional fixed rod 10 will be described with reference to Figure 3. Figure 3 is an enlarged view of the rope stopper showing the fixed rod being held by a worker.

As shown in FIG. 3, in order to remove the existing fixed rod 10 from the rod support 40 during the replacement of the main rope 7, the worker 80 removes the support nut 15 (see FIG. 2) from the male thread portion 16 of the fixed rod 10 while holding the fixed rod 10 with one hand. Then, the wire 77 for the rod guide rope is inserted into the split pin hole 18 provided at the upper end of the fixed rod 10, and the fixed rod 10 needs to be held with one hand until one end of the rod guide rope 78 is connected to the upper end of the fixed rod 10 via the wire 77 for the rod guide rope. After that, the existing main rope 7 is removed from the rod support 40 by pulling out the fixed rod 10 from the rod support 40 through the opening 41 while unwinding the rod guide rope 78 so as to pass through the inner diameter of the coil spring 13.

On the other hand, in the replacement work of the main rope 7, in order to attach the new fixed rod 10 to the rod support 40, one end of the rod guide rope 78 is connected in advance to the upper end of the fixed rod 10 on the lower side of the rod support 40 via the wire 77 for the rod guide rope. Next, the worker 80 pulls the rod guide rope 78 up to the upper side of the rod support 40 through the opening 41, and inserts the fixed rod 10 through the rod support side spring receiving member 12, the coil spring 13, and the support nut side spring receiving member 14 in this order, so that it protrudes above the rod support 40. The worker 80 needs to remove the rod guide rope 78 and the wire 77 for the rod guide rope from the upper end of the fixed rod 10 and hold the fixed rod 10 with one hand until the support nut 15 (see FIG. 2) is attached to the male thread portion 16 of the fixed rod 10. The new main rope 7 is attached to the rod support 40 by supporting the fixed rod 10 on the rod support 40 with the support nut 15 via the coil spring 13.

The fixed rod holding device 90 will be described in detail using Figures 4 to 7. Figure 4 is an oblique view of a fixed rod holding device, which is an example of an embodiment, seen from the closing portion side. Figure 5 is an oblique view of a fixed rod holding device, which is an example of an embodiment, seen from the connecting portion side. Figure 6 is a view of a fixed rod holding device, which is an example of an embodiment, seen from above. Figure 7 is an overall oblique view showing a fixed rod holding device, which is an example of an embodiment, in an open state.

As shown in Fig. 4, the fixed rod gripping device 90 includes a holding section 94 including a first block 91 and a second block 92 connected by a connecting member 93 so as to be capable of opening and closing in the horizontal direction. The connecting member 93 is, for example, a hinge.

Since the elevator main rope 7 is usually fixed to the rod support 40 (see FIG. 2) by a rope stopper 9 (see FIG. 2), the horizontal size of the holding part 94 of the fixed rod gripping device 90 in the closed state is preferably smaller than that of the support nut side spring receiving member 14 (see FIG. 2) in order to avoid interference with the nearby rope stopper 9. In addition, the support nut side spring receiving member 14 is preferably, for example, disc-shaped, and its outer diameter is preferably larger than the outer shape of the lower end surface of the holding part 94 in the closed state. This allows the contact area between the lower end surface of the holding part 94 and the upper surface of the support nut side spring receiving member 14 to be increased, so that the surface pressure applied from the holding part 94 to the support nut side spring receiving member 14 can be reduced. Therefore, the support nut side spring receiving member 14 can stably hold the holding part 94 while suppressing its own deformation.

As shown in Figure 5, when the connecting member 93 is a hinge, the blades 100 and 101, which are connected so as to be rotatable via a hinge axis 102, are fixed to the first block 91 and the second block 92, respectively, by screws 103, and the holding portion 94 can be opened and closed horizontally.

When the holding portion 94 is in a closed state, a through hole 95 through which the fixed rod 10 can pass is provided on the joint surface of the first block 91 and the second block 92.

The through hole 95 is formed with a locking portion 96 that engages with a male threaded portion 16 (see FIG. 2) provided on the outer periphery of the fixed rod 10 and has the function of preventing axial movement of the fixed rod 10. In the embodiment, the locking portion 96 is a female threaded portion provided on the inner periphery of the through hole 95.

As described below, even when the support nut 15 (see FIG. 2) is removed from the fixed rod 10, the fixed rod gripping device 90 needs to support the fixed rod 10 with a force equal to or greater than that of the support nut 15. For this reason, it is preferable that the height of the holding portion 94 in the closed state is equal to or greater than that of the support nut 15, and that each of the blocks 91, 92 is made of the same type of metal as the support nut 15, such as iron. With this configuration, an engagement length between the holding portion 94 and the fixed rod 10 that is equal to or greater than the engagement length between the support nut 15 and the fixed rod 10 can be secured, and the fixed rod gripping device 90 can support the fixed rod 10 with a supporting force equal to or greater than that of the support nut 15.

As shown in Figure 6, a closing portion 97 that closes the first block 91 and the second block 92 is provided on the side of the retaining portion 94 opposite the connecting member 93.

7, the closing section 97 includes a lever 102 rotatably attached to the first block 91, a hook 103 rotatably attached to the lever 102, and a receiving device 104 fixed to the second block 92. When the hook 103 hooked on the receiving device 104 is pulled by rotating the lever 102, the tension of the hook 103 closes the first block 91 and the second block 92.

The closing portion 97 further includes a locking portion 98. The locking portion 98 is, for example, a cylinder pin, and has the effect of maintaining the closed state of the holding portion 94. Specifically, the locking portion 98 has the effect of preventing the lever 102 from rotating by inserting the locking portion 98 through an integrated through hole formed by overlapping a first locking hole 106 provided in a fixed substrate 105 that is fixed to the first block 91 and that rotatably attaches the lever 102 to the first block 91 with a second locking hole 107 provided in the lever 102 when the holding portion 94 is in the closed state. This maintains the closed state of the holding portion 94.

The usage state of the fixed rod holding device 90 will be described using Figures 8 to 10. Figures 8 to 10 are enlarged views of the rope stopper showing the usage state of the fixed rod holding device, which is one example of an embodiment.

As shown in Figure 8, when removing the existing fixed rod 10 from the rod support body 40 during the replacement work of the main rope 7, the fixed rod 10 is pulled up to separate the coil spring 13 and the support nut 15, and the fixed rod holding device 90 is attached between the support nut side spring receiving member 14 placed on the coil spring 13 and the support nut 15.

Next, as shown in Figure 9, the support nut 15 (see Figure 8) is removed from the male thread portion 16 of the existing fixed rod 10. When the fixed rod holding device 90 attached to the existing fixed rod 10 is in a closed state, the locking portion 96 of the fixed rod holding device 90 engages with the male thread portion 16 of the existing fixed rod 10, and has the effect of preventing axial movement of the existing fixed rod 10 even when the support nut 15 is removed. By using the fixed rod holding device 90, the process in which a worker holds the fixed rod 10 with one hand to prevent axial movement of the existing fixed rod 10 after removing the support nut 15 is no longer necessary.

10, one end of the rod guide rope 78 is connected via a rod guide rope wire 77 inserted through a split pin hole 18 provided at the upper end of the existing fixed rod 10. Thereafter, the fixed rod holding device 90 is removed from the fixed rod 10, and the existing fixed rod 10 is pulled out of the rod support 40 through the opening 41 while the rod guide rope 78 is being let out, thereby removing the existing main rope 7 from the rod support 40.

On the other hand, when attaching a new fixed rod 10 to the rod support 40 during the replacement of the main rope 7, first, one end of the rod guide rope 78 is connected to the upper end of the fixed rod 10 via the rod guide rope wire 77 on the underside of the rod support 40. The rod guide rope 78 is then pulled up to the upper side of the rod support 40 through the opening 41, and the new fixed rod 10 is inserted through the rod support side spring receiving member 12, the coil spring 13, and the support nut side spring receiving member 14, in that order, until it protrudes above the rod support 40. The worker attaches the fixed rod gripping device 90 to the male threaded portion 16 of the fixed rod 10.

When the fixed rod holding device 90 attached to the new fixed rod 10 is in a closed state, the locking portion 96 of the fixed rod holding device 90 engages with the male thread portion 16 of the existing fixed rod 10, and has the effect of preventing axial movement of the new fixed rod 10 without the need for an operator to hold it. By using the fixed rod holding device 90, the process in which an operator holds the fixed rod 10 with one hand to prevent axial movement of the new fixed rod 10 after pulling the new fixed rod 10 up to the upper side of the rod support 40 through the opening 41 is no longer necessary.

Next, the rod guide rope 78 and the rod guide rope wire 77 are removed from the upper end of the fixed rod 10, and a support nut 15 is attached to the male threaded portion 16 of the fixed rod 10. The fixed rod holding device 90 is removed from the fixed rod 10, and the fixed rod 10 is supported by the rod support 40 via the coil spring 13, allowing the new main rope 7 to be attached to the rod support 40.

Using Figures 11 to 17, a method for replacing the main rope of a 2:1 roping elevator using a fixed rod holding device 90 will be described. Figure 11 is a flow diagram showing a method for replacing the main rope of a 2:1 roping elevator. Figure 12 is a diagram showing a schematic configuration for explaining a method for replacing the main rope of a 2:1 roping elevator. Figures 13 and 14 are diagrams showing a schematic configuration for explaining the removal of an existing fixed rod in a method for replacing a main rope using a fixed rod holding device, which is an example of an embodiment.

Figure 15 is a diagram showing a schematic configuration for explaining the mid-way state of a method for replacing a main rope using a fixed rod holding device, which is an example of an embodiment. Figure 16 is a diagram showing a schematic configuration for explaining the installation of a newly installed fixed rod, which is an example of an embodiment. Figure 17 is a diagram showing a schematic configuration for explaining the installation of a newly installed fixed rod and the completed state of a method for replacing a main rope using a fixed rod holding device, which is an example of an embodiment.

As shown in Figure 11, when replacing the main rope of a 2:1 rope elevator, first the car 2 and counterweight 3 are fixed in the hoistway 1 (Figure 11 S1). Specifically, as shown in Figure 12, a counterweight fixing jig 32 is installed at the bottom of the hoistway 1 to fix the counterweight 3. A scaffolding 33 is installed near the fixed counterweight 3. The car 2 is fixed in the hoistway 1 at a position where the top floor landing 22 and the top surface of the car 2 are flush with each other using a fixing jig (not shown) such as a sling rope or chain block.

In preparation for other equipment, a winch 42 is installed in the machine room 4.

The workers are, but are not limited to, a car worker 25 on top of the car 2, a machine room worker 26 in the machine room 4, a bottom floor worker 27 at the bottom floor landing 23, and a top floor worker 28 at the top floor landing 22. It is preferable that a fence 24 is installed above the car 2.

The existing main rope 71 is shown by a dashed line. The existing main rope 71 is wound around each pulley in the machine room 4 and the hoistway 1 through an opening 41 provided in the rod support 40. The existing main rope 71 is cut at cutting points 73, 74, 75, and 76 and then recovered. The existing main ropes 71 cut at each cutting point are referred to as existing main ropes 71-1 to 71-5, respectively, and the fixed rods 10 connected to the ends of the existing main ropes 71-3 and 71-4 are referred to as existing fixed rods 61 and existing fixed rods 62, respectively.

The new main rope 72 is installed at the top floor landing 22. At the top floor landing 22 and the bottom floor landing 23, an existing main rope winding drum 82 for the top floor and an existing main rope winding drum 83 for the bottom floor are installed to retrieve the existing main rope 71, completing preparations for replacing the main rope.

Next, the existing main rope 71 suspended in the middle of the hoistway 1 on the counterweight 3 side is retrieved (Fig. 11 S2). Specifically, as shown in Fig. 12, the existing main rope 71-1 cut at the cutting points 73 and 74, and the existing main rope 71-2 cut at the cutting points 73 and 75 are connected to the winch rope 44 connected to the winch 42 via a connecting jig such as a shackle (not shown), and lowered to the vicinity of the lowest floor landing 23, where the lowest floor worker 27 winds and retrieves the existing main rope for the lowest floor onto the winding drum 83.

Next, the existing fixed rod 61 and the existing fixed rod 62 are each removed from the rod support 40 using the fixed rod holding device 90 (FIG. 11 S3). Specifically, as shown in FIG. 13, the fixed rod holding device 90 is attached to the existing fixed rod 61, and the support nut 15 (see FIG. 8) is removed. Then, one end of the rod guide rope 78 is connected to the upper end of the existing fixed rod 61 via the wire 77 for the rod guide rope.

Then, the fixed rod gripping device 90 is removed from the existing fixed rod 61, and while the rod guide rope 78 is being paid out, the existing fixed rod 61 is pulled out from the rod support 40 through the opening 41, and the existing main rope 71-3 is removed from the rod support 40. The existing main rope 71-3 sent out to the top floor landing 22 by the car worker 25 is wound up and collected by the top floor worker 28 onto the existing main rope winding drum 82 for the top floor.

Next, as shown in Figure 14, the car worker 25 cuts the existing main rope 71 at the cutting point 76. The machine room worker 26 attaches the fixed rod gripping device 90 to the existing fixed rod 62 in the same manner as the existing fixed rod 61 (see Figure 13), removes the support nut 15 (see Figure 8), and then connects one end of the rod guide rope 78 to the upper end of the existing fixed rod 62 via the rod guide rope wire 77.

Then, the fixed rod holding device 90 is removed from the existing fixed rod 62, and while the rod guide rope 78 is being paid out, the existing fixed rod 62 is pulled out from the rod support 40 through the opening 41, and the existing main rope 71-4 is removed from the rod support 40. At the top floor landing 22, the top floor worker 28 winds and recovers the existing main rope 71-4 onto the top floor existing main rope winding drum 82.

The cage worker 25 connects the end of the existing main rope 71-5 on the cut point 76 side to the end of the new main rope 72 via a connecting jig 79 (see S4 in Figure 11 and Figure 15).

Next, the new main rope 72 is wound and the existing main rope 71-5 in the middle part on the car 2 side is retrieved (Fig. 11 S5). As shown in Fig. 15, at the top floor landing 22, the top floor worker 28 winds the existing main rope 71-5 onto the top floor existing main rope take-up drum 82. At the same time, the machine room worker 26 winds the new main rope 72, which has been connected to the existing main rope 71-5 and sent out into the machine room 4, around the sheave 51 and the deflector 6, and lowers it through the opening 41 to above the car 2. After the car worker 25 removes the connecting jig 79 and separates the existing main rope 71-5 from the new main rope 72, the top floor worker 28 winds the existing main rope 71-5 onto the top floor existing main rope winding drum 82 at the top floor landing 22, completing the recovery of the existing main rope 71.

After that, in FIG. 16, the car-mounted worker 25 pays out the end of the new main rope 72 to the vicinity of the counterweight 3. The bottom floor worker 27 passes the new main rope 72 through the counterweight pulley 31, completing the winding of the new main rope 72.

Next, the fixed rod gripping device 90 is used to attach the new fixed rod 63 connected to the end of the new main rope 72 and the new fixed rod 64, which will be described later in FIG. 17, to the rod support 40 (FIG. 11 S6). The lowest floor worker 27 connects the rope socket 8 to the end of the new main rope 72 and connects the new fixed rod 63 to the opposite opening of the rope socket 8. The machine room worker 26 reels out the winch rope 44 connected to the winch 42 to the vicinity of the counterweight 3, and the lowest floor worker 27 connects the winch rope 44 and the new fixed rod 63 via a connecting jig such as a shackle (not shown). The machine room worker 26 winds up the winch rope 44 with the winch 42 and pulls up the new fixed rod 63 to the vicinity of the rod support 40.

The car worker 25 connects one end of the rod guide rope 78 to the upper end of the newly installed fixed rod 63 via a rod guide rope wire 77.

As shown in Figure 16, the machine room worker 26 pulls up the rod guide rope 78 through the opening 41, causing the newly installed fixed rod 63 to protrude above the rod support 40. The fixed rod holding device 90 is attached to the newly installed fixed rod 63, and the rod guide rope 78 and the rod guide rope wire 77 are removed from the upper end of the newly installed fixed rod 63. After attaching a support nut 15 (see Figure 8) above the fixed rod holding device 90, the fixed rod holding device 90 is removed, causing the newly installed fixed rod 63 to be supported by the rod support 40, and the new main rope 72 is attached to the rod support 40.

As shown in FIG. 17, the car worker 25 connects the rope socket 8 to the car 2 side end of the new main rope 72 and connects the new fixed rod 64 to the opposite opening of the rope socket 8. One end of the rod guide rope 78 is connected to the upper end of the new fixed rod 64 via the wire 77 for the rod guide rope. The machine room worker 26 pulls up the rod guide rope 78 through the opening 41 to protrude the new fixed rod 64 above the rod support 40. The fixed rod holding device 90 is attached to the new fixed rod 64 and the rod guide rope 78 and the wire 77 for the rod guide rope are removed from the upper end of the new fixed rod 64. After attaching the support nut 15 (see FIG. 8) above the fixed rod holding device 90, the new fixed rod 64 is supported by the rod support 40 and the new main rope 72 is attached to the rod support 40 by removing the fixed rod holding device 90.

After both ends of the new main rope 72 are supported by the rod supports 40, the winch 42 and other devices are removed. The counterweight fixing jig 32, the scaffolding 33, and the fixing jig for the car 2 (not shown) are removed, and the car 2 and counterweight 3 are released from their fixed state, completing the series of operations of removing the existing main rope 71 (see Figure 12) and replacing it with the new main rope 72 (Figure 11 S7).

As described above, the method of recovering the existing main rope 71 using the fixed rod holding device 90 and replacing it with a new main rope 72 specifically includes the following steps.
(1) A process of lifting up the existing fixed rods 61, 62 to separate the coil spring 13 and the support nut 15, and attaching the fixed rod gripping device 90 between the coil spring 13 and the support nut 15;
(2) a process of removing the support nuts 15 from the male threaded portions 16 of the existing fixed rods 61, 62, connecting one end of a rod guide rope 78 to the upper end of the existing fixed rods 61, 62 via a wire 77 for a rod guide rope, removing the fixed rod holding device 90 from the existing fixed rods 61, 62, pulling out the existing fixed rods 61, 62 from the rod support body 40 while letting out the rod guide rope 78, and removing the existing main rope 71 from the rod support body 40;
(3) A process of connecting one end of a rod guide rope 78 to the upper end of the newly installed fixed rod 63, 64 via a wire 77 for the rod guide rope, and then pulling the rod guide rope 78 up to the upper side of the rod support 40, and attaching a fixed rod holding device 90 to the newly installed fixed rod 63, 64 via a coil spring 13;
(4) A process of removing the rod guide rope 78 and the wire 77 for the rod guide rope from the upper end of the newly installed fixed rod 63, 64, and attaching a support nut 15 to the male threaded portion 16 of the newly installed fixed rod 63, 64. (5) A process of removing the fixed rod holding device 90 from the newly installed fixed rod 63, 64, supporting the newly installed fixed rod 63, 64 on the rod support body 40 via the coil spring 13, and attaching the newly installed main rope 72 to the rod support body 40.

By using the fixed rod holding device 90 with the above configuration, axial movement of the fixed rod 10 is prevented, so that when replacing the elevator's main rope, the worker does not need to hold the fixed rod 10 with one hand while using the other hand to perform tasks such as tightening and loosening the support nut 15. After holding the fixed rod 10 with the fixed rod holding device 90, the worker can use both hands to tighten and loosen the support nut 15 and attach and remove the rod guide rope 78, making it easier to replace the main rope.

The above embodiment may be modified as appropriate without impairing the object of the present invention. For example, the male thread portion 16 of the fixed rod 10 may be provided at both ends or over the entire range of the fixed rod 10 so that the fixed rod 10 can be used without having to pay attention to the difference between the upper end and the lower end.

1 elevator shaft, 2 car, 3 counterweight, 4 machine room, 5 hoist, 6 deflector, 7 main rope, 8 rope socket, 9 rope stopper, 10 fixed rod, 11 rod pin, 12 spring support member on rod support side, 13 coil spring, 14 spring support member on support nut side, 15 support nut, 16 male threaded portion, 21 car pulley, 22 top floor landing, 23 bottom floor landing, 25 car worker, 26 machine room worker, 27 bottom floor worker, 28 top floor worker, 31 counterweight pulley, 32 counterweight fixing jig, 33 scaffolding, 40 rod support, 41 opening, 42 electric winch, Description of symbols 51 sheave, 61, 62 existing fixed rod, 63, 64 new fixed rod, 71 existing main rope, 72 new main rope, 73-76 cut point, 77 wire for rod guide rope, 78 rod guide rope, 81 rope fixing jig, 82 existing main rope take-up drum for top floor, 83 existing main rope take-up drum for bottom floor, 90 fixed rod gripping device, 91 first block, 92 second block, 93 connecting member, 94 holding portion, 95 through hole, 96 locking portion, 97 closing portion, 98 locking portion

Claims (5)

A fixed rod gripping device for an elevator in which a fixed rod connected to an end of a main rope of the elevator is supported by a support nut via a coil spring on a rod support provided in a hoistway, the fixed rod being gripped between the support nut and the coil spring when the fixed rod is removed from or attached to the rod support, the device comprising:
a holding section including a first block and a second block connected by a connecting member so as to be openable and closable in a horizontal direction;
a through hole through which the fixing rod can pass when the holding portion is in a closed state, the first block and the second block are joined to each other by a through hole;
a locking portion is formed in the through hole to engage with a male screw portion provided on the outer periphery of the fixed rod and prevent the fixed rod from moving in the axial direction;
A closing portion for closing the first block and the second block is provided on the opposite side of the holding portion to the connecting member side.
Fixed rod gripping device. the closure portion includes a lever pivotally attached to the first block, a hook pivotally attached to the lever, and a receiver fixed to the second block;
2. The fixed rod gripping device according to claim 1, wherein the hook hooked on the receiving tool is pulled by rotating the lever, and the first block and the second block are closed by the tension of the hook. The closing unit further includes a locking unit that maintains the holding unit in a closed state,
The fixed rod gripping device according to claim 2, characterized in that the locking portion is fixed to the first block, and is inserted through a first locking hole provided in a fixed base plate for rotatably mounting the lever to the first block and a second locking hole provided in the lever when the holding portion is in a closed state, thereby preventing the lever from rotating. The fixed rod gripping device according to claim 1, characterized in that the engaging portion is a female threaded portion provided on the inner circumference of the through hole which engages with the male threaded portion provided on the outer circumference of the fixed rod. A method for replacing an elevator main rope using the fixed rod gripping device according to claim 1, comprising the steps of:
In order to remove the existing fixed rod connected to the end of the existing main rope from the rod support,
a step of lifting up the existing fixed rod to separate the coil spring and the support nut, and attaching the fixed rod gripping device between the coil spring and the support nut;
a step of removing the support nut from the male thread portion of the existing fixed rod, connecting one end of a rod guide rope to an upper end portion of the existing fixed rod via a wire for a rod guide rope, removing the fixed rod holding device from the existing fixed rod, pulling out the existing fixed rod from the rod support while letting out the rod guide rope, and removing the existing main rope from the rod support;
To attach a new fixed rod connected to an end of a new main rope to the rod support,
a step of connecting one end of the rod guide rope to an upper end of the newly-installed fixed rod via a wire for the rod guide rope, and then pulling the rod guide rope up to the upper side of the rod support, and attaching the fixed rod gripping device to the newly-installed fixed rod via the coil spring;
removing the rod guide rope and the wire for the rod guide rope from the upper end of the newly-installed fixed rod, and attaching the support nut to the male thread portion of the newly-installed fixed rod;
a step of removing the fixed rod holding device from the newly installed fixed rod, supporting the newly installed fixed rod on the rod support via the coil spring, and attaching the newly installed main rope to the rod support;
The method for replacing the main rope of an elevator comprises:

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